Drug interactions
Clozapine + Metformin-sitagliptin
Severity: Major
Clozapine and Metformin-sitagliptin: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Clozapine is strongly associated with hyperglycemia, new-onset diabetes and ketoacidosis, which can undermine control with metformin and sitagliptin. Glucose deterioration may be rapid and severe.
What this interaction means in plain words
Clozapine and Metformin-sitagliptin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Clozapine belongs to Central Nervous System; Metformin-sitagliptin belongs to Endocrine.
Why it happens
Pharmacodynamic antagonism through clozapine-induced weight gain, insulin resistance and impaired insulin secretion.
What to do
Monitor fasting glucose and HbA1c frequently, particularly in the first months. Intensify antidiabetic therapy early and review clozapine continuation if control fails.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Metformin-sitagliptin
Other interactions of Clozapine
- Clozapine + Deferiprone Contraindicated
- Clozapine + Irinotecan Contraindicated
- Clozapine + Pimozide Contraindicated
- Clozapine + Thioridazine Contraindicated
- Acalabrutinib + Clozapine Major
- Adagrasib + Clozapine Major
Frequently asked questions
Can I take Clozapine with Metformin-sitagliptin?
MediHelp rates the interaction as major. Clozapine and Metformin-sitagliptin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Clozapine is strongly associated with hyperglycemia, new-onset diabetes and ketoacidosis, which can undermine control with metformin and sitagliptin. Glucose deterioration may be rapid and severe.
How serious is the interaction between Clozapine and Metformin-sitagliptin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor fasting glucose and HbA1c frequently, particularly in the first months. Intensify antidiabetic therapy early and review clozapine continuation if control fails.
What other medicines interact with Metformin-sitagliptin?
MediHelp also lists interactions of Metformin-sitagliptin with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Metformin-sitagliptin page.
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